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Old 02-15-2019, 09:11 AM   #1
SubeN'Siren
Scooby Newbie
 
Member#: 151171
Join Date: Jun 2007
Chapter/Region: MWSOC
Location: Siren, WI
Vehicle:
02 Subaru WRX
Blue

Default Target boost vs Manifold relative pressure discrepancies

02 wrx logging with tactrix.
Logging target boost (psi relative to sea level) and Manifold Relative Pressure (psi relative to sea level).

There is a large discrepancy at vacuum, for example:.
target at idle log is -.93
Manifold log reads -6.79 to -7.79
Is this indicating a problem, or am I not quite understanding this?
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Old 02-16-2019, 01:56 AM   #2
JSR84
Scooby Specialist
 
Member#: 469585
Join Date: Jun 2017
Chapter/Region: W. Canada
Vehicle:
2009 STi
White

Default

Quote:
Originally Posted by SubeN'Siren View Post
02 wrx logging with tactrix.
Logging target boost (psi relative to sea level) and Manifold Relative Pressure (psi relative to sea level).

There is a large discrepancy at vacuum, for example:.
target at idle log is -.93
Manifold log reads -6.79 to -7.79
Is this indicating a problem, or am I not quite understanding this?
Vacuum results from the mechanical principles of the engine and atmosphere pressure, its not controlled by the ECU such as boost. No issues there, other than your vacuum may be low, depending on where you live and whats done to the engine.
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Old 07-27-2019, 05:16 PM   #3
contaminatrix
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Member#: 435611
Join Date: Dec 2015
Chapter/Region: International
Location: Nairobi
Vehicle:
2002 SG5-2.0-XT-JDM
45A, originally 18L

Default

to convert psi to vacuum, multiply by 2.. so your -7.79 would be -15.58 which is good vacuum.

17 to 22 is recommended, but 15.5 is pretty solid as well.
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